Data for Hermann Corporation are shown below: Selling price Variable expenses Contribution margin Per Unit $ 90 63 $ 27 Percent of Sales 100% 70 30% Fixed expenses are $78,000 per month and the company is selling 3,500 units per month. Exercise 6-5 Part 2 2-a. Refer to the original data. How much will net operating income increase (decrease) per month if the company uses higher-quality components that increase the variable expense by $4 per unit and increase unit sales by 20%. 2-b. Should the higher-quality components be used